Table 1

Demographic data and substance use history of methadone maintained, protracted abstinence and non-dependent comparison groups, using Chi-squared testing (χ2) for categorical variables, and ANOVA (F) for continuous variables.

Methadone Maintained
(n = 29)
 Protracted Abstinence
(n = 27)
 Comparison
(n = 28)
 Statistics
 Significance
Gender




     Male
 23 (79.3%)
 20 (74%)
 21(72.4%)
 χ2 = 0.49
 p = 0.78
     Female
 6 (20.7%)
 7 (26%)
 8 (27.6%)
 df = 2
Ethnicity




     African American
 6 (20.7%)
 11 (40.7%)
 10 (34.7%)

     European American
 11 (37.9%)
 7 (25.9%)
 12 (41.4%)

     Hispanic
 12 (41.4%)
 7 (25.9%)
 3 (10.3%)
 χ2 = 14.95 df = 10
 p = 0.13
     Asian
 0 (0%)
 0 (0%)
 1 (3.4%)

     Native Am./Pacific Islands
 0 (0%)
 0 (0%)
 1 (3.4%)

     Other
 0 (0%)
 2 (7.5%)
 2 (6.8%)

Age Years: Mean ± S.D.
 37.93 ± 7.5
 42.59 ± 5.4
 34.00 ± 8.0
 F(2,84) = 10.21
 p < 0.001
Education Years: Mean ± S.D.
 13.03 ± 4.8
 11.81 ± 2.2
 15.51 ± 1.8
 F(2,84) = 9.32
 p < 0.001
Substance Use History




Mean ± S.D.




     Age of Onset: Years
 19.36 ± 5.5
 23.32 ± 8.9
 N/A
 F = 3.88; df = 1
 p = 0.054
     Years of heroin use
 14.72 ± 8.9
 14.68 ± 9.0
 N/A
 F = 0.00 df = 1
 p = 0.98
     Daily dollar amount: $
 122.96 ± 105.09
 124.57 ± 115.90
 N/A
 F = 0.003 df = 1
 p = 0.959
Substance Treatment History




Mean ± S.D.




     Years of MM
 6.48 ± 7.03
 6.85 ± 6.80
 N/A
 F = 0.038 df = 1
 p = 0.847
     Highest methadone dose (mg/day)
 88.21 ± 25.54
 83.68 ± 30.22
 N/A
 F = 0.307 df = 1
 p = 0.582
     Years of opiate abstinence
 N/A
 0.89 ± 0.37
 N/A
 N/A

N/A = not applicable

Years of MM = years of methadone maintenance

Prosser et al. Substance Abuse Treatment, Prevention, and Policy 2008 3:23   doi:10.1186/1747-597X-3-23

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